Incorporates

9

NEP 2020

SCIENCE WORKBOOK

Highlights • Chapter-wise MCQs based on Bloom’s Taxonomy • Separate MCQs based on HOTS (Higher Order Thinking Skills) • Sample PISA (Programme for International Student Assessment) questions • 2 Mock Tests for self evaluation • Sample OMR Sheet

9

SCIENCE WORKBOOK

RK Srivastav

Highlights • Chapter-wise MCQs based on Bloom’s Taxonomy • Separate MCQs based on HOTS (Higher Order Thinking Skills) • Sample PISA (Programme for International Student Assessment) questions • 2 Mock Tests for self evaluation • Sample OMR Sheet

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Copyright © Publishers No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher. Although every safety measure has been taken to verify the precision of the information contained herein, the author(s) and publisher assume no responsibility for any error or omission. No liability is assumed for damages that may result from the use of information contained within. All product names, brand names and product logos mentioned or shown in this book are trademarks, registered trademarks, or trade names of their respective owners. The reproduction of these product names, brand names, and product logos and all instances of references of proprietary software in this book, are for educational purposes only.

PREFACE The aim of the OGO Science Workbook is to provide quality resources that will serve as a benchmark for students to attain requisite knowledge and skills in developmentally apposite ways. The book will also help in fostering social skills, a strong sense of self-worth, and an optimistic approach towards learning. This book endeavours to elevate the scientific application skills of the 21st century students. The theoretical as well as practical aspects of the subject have been simplified for a better understanding. This will help them to keep pace with time and face any competition. The book has been logically divided into chapters for the enhancement of interpretation. Each chapter contains MCQs based on the related topics. The questions are based on the six levels of understanding as given in Bloom’s Taxonomy viz. Knowledge, Comprehension, Application, Analysis, Synthesis and Evaluation, which help in the development of the cognitive faculty of a student. The questions based on HOTS-Higher Order Thinking Skills, given at the end of each chapter encourage students to “think out of the box”. The Mock Test Papers prepare students attempt the questions in the same format as in the actual examination and making them adept at problem solving. The answers of the MCQs, HOTS and Mock Test Papers have been incorporated at the end of the book. The book is a fruition of sincere efforts and research by our authors and the editorial team. It will be our constant endeavour to make this book more valuable. We solicit feedback and suggestions from the users of this book for further improvement. —Publishers

(iii)

Chapter

Page No.

1. Matter in Our Surroundings ............................................................................... 5 2. Is Matter Around Us Pure ................................................................................ 11 3. Atoms and Molecules ...................................................................................... 16 4. Structure of the Atom ...................................................................................... 20 5. The Fundamental Unit of Life .......................................................................... 25 6. Tissues .............................................................................................................. 31 7. Diversity in Living Organisms ........................................................................... 37 8. Motion .............................................................................................................. 44 9. Force and Laws of Motion ............................................................................... 49 10. Gravitation ........................................................................................................ 54 11. Work and Energy .............................................................................................. 59 12. Sound ................................................................................................................ 63 13. Why do we Fall Ill ............................................................................................ 67 14. Natural Resources ............................................................................................ 73 15. Improvement in Food Resources ..................................................................... 78 16. Logical Reasoning............................................................................................... 83 Mock Test 1 .................................................................................................................. 87 Mock Test 2 .................................................................................................................. 94 Answers....................................................................................................................... 102 Practice Answer Sheet ............................................................................................... 111

(iv)

1

Matter in Our Surroundings

1. Which of the following diagrams shows the arrangement of particles inside a balloon filled with a mixture of helium and argon?

(A)

(B)

(C)

(D)

2. Which of the following gives out heat energy (exothermic) and involves in the largest change in volume? (A) Boiling

(B) Freezing

(C) Sublimation

(D) Condensation

3. What will happen to the volume of a balloon filled with helium, up in the sky if temperature is almost constant? (A) Volume will remain same (C) Volume will decrease

(B) Volume will increase (D) Volume will first increase then decrease

4. An inflated balloon shrinks, when kept in the refrigerator. This happens because of (A) movement of particles decreases and they come closer. (B) particles contracts, due to low temperature. (C) particles expands, due to low temperature. (D) movement of particles increases and they will go apart. Matter in Our Surroundings

5

5. Titan is the largest moon of Saturn Substance H2 N2 C2H6 CH4 Ar H2O and has a surface temperature around 95 K. The given table Melting Point (K) 14 K 63 K 90 K 91 K 84 K 273 K represents the substances found Boiling Point (K) 21 K 77 K 184 K 111 K 87 K 373 K on the surface of the titan. What is likely to be found in the atmosphere of Titan? (A) H2O

(B) C2H6 and CH4

(C) H2, N2 and Ar

(D) H2, N2 and CH4

6. A few crystals of orange Potassium dichromate (VI) were added in a beaker of water which was covered with a watch glass and kept still without stirring for 2 hours. Which of the following best depicts the change in 2 hours?



7.

(A)

(B)

(C)

(D)

Gases are highly compressible. Choose the appropriate reason. (A) Gases are made up of small particles in continuous random motion. (B) Gas particles experience strong forces of attraction. (C) Gas particles can contract and occupy small volume at high pressure. (D) Volume of gas particles is negligible as compared to the total volume and has negligible force of attraction.

8. A mixture of water and ice is boiled with constant stirring. If the temperature of mixture is plotted with respect to time in min, which is the correct graph for this process?

6

(A)

(B)

(C)

(D)

OGO Science Workbook 9

9. Three substances P, Q and R have following properties: ‘P’ is malleable and ductile. ‘Q’ melts at 5°C and boils at 100°C. ‘R’ melts at 1000°C, and conducts electricity in only its molten state. What is the state of each substance in molten form at room temperature 25°C and 1 atm pressure? P

Q

R

(A)

Gas

Liquid

Gas

(B)

Liquid

Solid

Gas

(C)

Solid

Liquid

Solid

(D)

Gas

Solid

Liquid

10. Which of the following statements are correct, for taking bath with hot water? I. We feel more cold after taking bath.

II. We feel less cold after taking bath.

III. We feel less cold while taking bath.

IV. We feel more cold while taking bath.

(A) I and II

(B) II and III

(C) III and IV

(D) I and III

11. A gas can be liquefied at (A) low temperature and low pressure.

(B) low temperature and high pressure.

(C) high temperature and high pressure. (D) high temperature and low pressure. 12. Match the physical quantities given in column I with their SI unit presented in column II. Column I

Column II

p. Pressure

(i) kg m–3

q. Temperature

(ii) kg

r.

(iii) pascal

Density

s. Mass

(iv) kelvin

t.

(v) m3

Volume

(A) p–i, q–ii, r–iii, s–iv, t–v

(B) p–iii, q–iv, r–i, s–ii, t–v

(C) p–iii, q–i, r–iv, s–ii, t–v

(D) p–ii, q–iii, r–iv, s–v, t–i

13. A sample of water boils at 102°C at room temperature and atmospheric pressure. At what temperature, will this sample of water freeze? (A) 0°C

(B) Below 0°C

(C) Above 0°C

(D) Will not freeze at all

Matter in Our Surroundings

7

14. Liquid Nitrogen (boiling point 77 K) is used as a coolant even for heart transplantation. It is observed that ice forms at the opening of the liquid Nitrogen tank whensoever it is opened. What could be the reason? (A) Water trapped in liquid N2 freezes.

(B) Water vapour in the air get freezes.

(C) N2 becomes solid in contact with air. (D) CO2 of air gets solidified. 15. The given graph represents the temperature changes during the cooling of nitrogen at atmospheric pressure. What does CD and DE represents? (A) Liquid, solid and liquid (B) Solid and liquid (C) Gas and liquid (D) Gas and solid, liquid and gas 16. 5 g of iodine was taken in a small conical flask as shown in the diagram. All the air is removed with the help of vacuum pump, then it is tightly sealed. The weight of the conical flask along with iodine is 25 g. The conical flask is then heated until it was full of iodine vapours. What would be the weight of the conical flask and why? (A) 24 g, gas is lighter than solid (B) 22 g, some gas will escape (C) 25 g, mass remains conserved (D) 26 g, air will also enter in the conical flask 17. One gas jar contains bromine and other gas jar contains hydrogen gas. Two gas jars are kept over each other as represented in the given diagram. The glass lid was removed and gases were allowed to move. Which of the following is representing the correct state? (A)

(B)

(C)

(D)

18. NH3 gas reacts with HCl to form white ring of NH4Cl, as represented in the given diagram. Where would the white ring form in a glass tube of 100 cm? (A) Near NH3 cotton plug (B) Near HCl cotton plug (C) In the centre of the tube 8

(D) At extreme left

OGO Science Workbook 9

19. Three balloons are filled with equal volume of air, gas ‘X’ and gas ‘Y’. Then they are left at room temperature for one day. As balloons are made of porous material which allow the gas molecules to move in and out. It was found that balloons containing air and gas ‘X’ became smaller but the balloon containing gas ‘Y’ became larger. What could be the possible reason behind it? (A) ‘X’ diffuses faster than air

(B) ‘Y’ diffuses slower than air

(C) ‘X’ has higher moleculer mass than Y (D) ‘Y’ diffuses faster than air

HOTS 20. Which of the following consist of particles in constant motion? I. Ice at temperature –4°C II. Graphite at room temperature III. Molten Sodium chloride

IV. A balloon filled with hydrogen

(A) I and II

(B) II and III

(C) III and IV

(D) I, II, III and IV

21. The following graph represents the temperature of an unknown liquid heated until it started boiling. Identify boiling point of the liquid from the given graph and what will happen to the boiling point, if the liquid is heated even more strongly? (A) 50°C, no change in the boiling point (B) 60°C, boiling point will decrease (C) 70°C, no change in the boiling point (D) 80°C, boiling point will increase 22. A beaker containing hot liquid at 70°C is placed in a room. The temperature of the beaker and its contents changes as represented in the given graph. Find (i) the freezing point of the liquid, (ii) reasons of loss of heat over the section BC, and (iii) temperature of the room. (A) 40°C, latent heat of fusion is lost when liquid changes to solid, 20°C. (B) 50°C, latent heat of vaporisation is lost when liquid changes to solid, 10°C. (C) 70°C, latent heat of fusion is gained when liquid changes to solid, 20°C. (D) 60°C, latent heat of fusion is gained when liquid changes to solid, 30°C Matter in Our Surroundings

9

23. Which of the following factors affects the rate of evaporation? I. Temperature and exposed surface area of the liquid. II. Air flow and humidity in the surrounding air. III. Air pressure and nature of the liquid. (A) I

(B) II

(C) III

(D) I, II and III

24. The given diagram represents the arrangement of molecules in a substance at 1 atm pressure and at two different temperatures. Which of the following best describes the given diagrams? Melting point

Boiling point

(A)

–188°C

–90°C

(B)

–180°C

–162°C

(C)

–170°C

–108°C

(D)

–118°C

–80°C

Darken your Choice with HB Pencil 1.

A

B

C

D

6.

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10

OGO Science Workbook 9

2

Is Matter Around Us Pure

1. Tincture of iodine is used as antiseptic. It is obtained by dissolving (A) iodine in water (B) iodine in ethanol (C) iodine in Potassium iodide solution

(D) iodine in Carbon tetrachloride

2. Maggie noodles were banned in India recently, due to the presence of (A) excess of lead than permitted level (B) excess of Sodium chloride (C) excess of Monosodium glutamate

(D) both (A) and (C)

3. The excess of dissolved salts in drinking water can be removed by (A) U.V. purifier (B) filtration (C) osmosis

(D) reverse osmosis

4. Lila wanted to find out whether the substance she is using is pure or not. To do so, she used a setup as shown in the given diagram. Which method is it? (A) Paper chromatography

(B) Gas chromatography

(C) Column chromatography

(D) Partition chromatography

5. Which of the following cannot be separated by water as a solvent? (A) Sugar and salt

(B) Sulphur and sand

(C) Copper sulphate and sulphur

(D) Sugar and sulphur

6. Which of the followings are in their increasing order of boiling point? (A) O2, Ar, N2

(C) N2, O2, Ar

(B) Ar, N2, O2

(D) N2, Ar, O2

7. The pure sugar can be obtained from sugar solution by ________ method. (A) evaporation (B) distillation (C) crystallisation Is Matter Around Us Pure

(D) filtration 11

8. Which of the following statements are correct about Iron sulphide? I. It is a black coloured solid. II. It is attracted by magnet. III. It liberates H2S gas when reacts with dil. H2SO4, which smells like rotten eggs. IV. It is yellow in colour. (A) I and II (B) II and III (C) III and IV (D) I and III 9. Which of the following is used as a solvent in nail polish? (A) White spirit (B) Ethanol (C) Acetone (D) Water 10. A sample of sulphur melts at 119.5°C and boils at 445°C. Is it pure or impure? (A) Pure (B) Impure (C) Can’t be predicted (D) May be pure or might be improve 11. What is the temperature of ice mixed with ungrinded (crystalline) common salt? (A) 0°C (B) Above 0°C (C) Below 0°C (D) Above 100°C 12. The concentrated sugar solution used for making Jalebis and Gulab jamun is (A) saturated (B) unsaturated (C) supersaturated (D) none of these 13. Salt and sugar can be separated by (A) water (B) ethanol (C) acetone (D) acetic acid 14. If the given ink gets separated into three spots of red, yellow and blue colour in paper chromatography, then it shows that ink is (A) pure (B) made up of three colours red, yellow and blue (C) made up of two colours red and yellow (D) made up of two colours yellow and blue 15. Two chemicals species P and Q combines to produce R. If, P and Q can’t be broken down into simple substances, then which of the following statements about P, Q and R are correct? I. R is a compound. II. P, Q and R are compounds. III. R has fixed composition. IV. P and Q are elements. (A) I, II and III (B) II, III and IV (C) I, III and IV

(D) I, II and IV

16. The components of which of the following can be separated by fractional distillation?

12

(A) Petroleum and liquid air

(B) Air and coal

(C) Petroleum and coal

(D) All of these

OGO Science Workbook 9

17. A mixture of sulphur and Carbon disulphide is ______ and it does _______ effect. (A) heterogeneous, show Tyndall effect (B) homogeneous, show Tyndall effect (C) heterogeneous, not show Tyndall effect (D) homogeneous, not show Tyndall effect 18. Which of the following is used for adsorption of water to limit growth of mould on leather goods and electronic equipments? (A) SiO2 solid

(B) SiO2 gel

(C) CaCl2 fused

(D) SiO2 solution

19. Which of the following can be used to separate a mercury and ethanol mixture? (A) Filtration

(B) Distillation

(C) Separating funnel

(D) Paper chromotography

20. A student wants to separate a mixture of ethanol and water by using the given apparatus. The boiling point of ethanol is 78.5°C and water is 100°C. The liquid is collected in the conical flask at 82°C. Which of the following is desirable change you suggest to separate this mixture? (A) Increase the rate of heating. (B) Change the direction in which water enters the condenser. (C) Add broken china dish pieces to liquid mixture. (D) Insert a fractional column between the round flask and the condenser. 21. Sea salt is obtained from sea and it contain minerals in trace. Which of the following is the most energy efficient method for obtaining sea salt from sea water, also, ensuring the retention of trace elements? (A) Filtration

(B) Distillation

(C) Vacuum evaporation

(D) Crystallisation

Is Matter Around Us Pure

13

22. A substance is condensed using a water condenser. Which of the following substances will get condensed at room temperature at given boiling and melting points. Melting point/°C

Boiling point/°C

(A)

–115°C

–85°C

(B)

–16.6°C

9.5°C

(C)

–73°C

–10°C

(D)

–130°C

36°C

23. Hydrogen peroxide decomposes at its boiling point, therefore, it should be purified by (A) fractional distillation

(B) steam distillation

(C) distillation at reduced pressure

(D) distillation

24. Ortho-nitrophenol is steam volatile (vaporised by steam) whereas para-nitrophenol is not. They can be separated by (A) fractional distillation (C) vacuum distillation

(B) steam distillation (D) distillation

HOTS 25. The following setup was used by a student to separate a mixture of ethanol and water. Which of the following is an error in the given setup? (A) A wrong container was used to collect distillate. (B) The thermometer was placed too high in the fractional column. (C) T he conical flask containing the distillate was fitted with cork. (D) The direction of flow of water through the condenser is wrongly aligned. 26. A desert survival kit containing a plastic sheet and a cup is used for collecting water for drinking purposes, as represented in the given diagram. Which of the following is the overall process that takes place to obtain water in the cup?

14

(A) Filtration

(B) Dissolving

(C) Distillation

(D) Evaporation

OGO Science Workbook 9

27. A sheesha or hookah is a device used for smoking tobacco. It involves burning of tobacco which has been mixed with flavours such as honey, molasses or dried fruit in a water pipe and inhaled the flavoured smoke through a long hose. Which of the following harmful compounds in tobacco smoke are not likely to be removed by water? (A) Nictoine, tar and CO (B) Tar, CO and Phenanthrene (C) Nictoine, CO and Phenanthrene

(D) Nicotine and Phenanthrene

28. The following graph shows temperature change when a mixture of methanol (melting point –97°C, boiling point 65°C) and propan-2-ol (melting point –89°C, boiling point 82°C) was distilled. Distillate was collected at P, Q, R and S, indicated on the graph. Which fraction will contain the highest proportion of methanol? (A) P (B) Q (C) R

(D) S

29. The chromatogram was prepared by using four spots W, X, Y and Z, which was obtained from pigments extracted from different flowers with suitable solvent. Based on the result, how many different pigments were obtained from four different flowers? (A) 4 (B) 6 (C) 8

(D) 5

Darken your Choice with HB Pencil 1.

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Is Matter Around Us Pure

15

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